Yuma County, AZ population age distribution
A complete breakdown of Yuma County's age demographics from 0 to 85 years, distributed across 18 age groups is listed in the table below.
Age Group | Population | % of Total Population |
---|---|---|
Under 5 years | 14,282 | 7.04% |
5 to 9 years | 13,449 | 6.63% |
10 to 14 years | 15,191 | 7.49% |
15 to 19 years | 14,502 | 7.15% |
20 to 24 years | 16,221 | 7.99% |
25 to 29 years | 14,904 | 7.34% |
30 to 34 years | 13,383 | 6.59% |
35 to 39 years | 11,359 | 5.6% |
40 to 44 years | 11,063 | 5.45% |
45 to 49 years | 10,044 | 4.95% |
50 to 54 years | 10,184 | 5.02% |
55 to 59 years | 9,670 | 4.76% |
60 to 64 years | 10,193 | 5.02% |
65 to 69 years | 10,125 | 4.99% |
70 to 74 years | 9,258 | 4.56% |
75 to 79 years | 9,071 | 4.47% |
80 to 84 years | 5,721 | 2.82% |
85 years and over | 4,324 | 2.13% |
TABLE OF CONTENTS
Yuma County, AZ population by age group
Sources: U.S. Census Bureau, American Community Survey (ACS) 2021

The largest age group in Yuma County, AZ was for the group of age 20-24 years with a population of 16,221 (7.99%), according to the 2021 American Community Survey.
At the same time, the smallest age group in Yuma County, AZ was the 85+ years with a population of 4,324 (2.13%).
Yuma County, AZ population by age cohort
To better understand the age distribution of Yuma County, AZ's population, we divided it into the following 3 cohorts:
- Children : Under the age of 18 years
- Adults (working population): Between the age of 18 and 64 years
- Seniors: 65 years and above

Here's the population for each of the three cohorts.
Age Group | Population | % of Total Population |
---|---|---|
Under 18 years | 51,483 | 25.37% |
18 to 64 years | 112,962 | 55.66% |
85 years and over | 38,499 | 18.97% |
Key stats for each age cohort as per our analysis of U.S. Census Bureau American Community Survey:
- Yuma County's population under 18 was 25.37%, compared to the 22.51% nationwide.
- Yuma County's working population (between 18 and 64) was 55.66%, compared to 61.45% nationwide.
- Yuma County's elderly or the senior population (over 65 age) was 18.97% as compared to 16.04% nationwide.
Yuma County, AZ population pyramid
Population pyramid for Yuma County, AZ is charted below using the estimates from U.S. Census Bureau's American Community Survey 5-Year estimates. A wide base suggests population increase, narrow base indicates declining birth rates.
Key stats from our analysis of the Yuma County's population pyramid:
- Youth dependency ratio, which is the number of children aged 0-14 per 100 persons aged 15-64, for Yuma County, AZ, is 35.3.
- Old-age dependency ratio, which is the number of persons aged 65 or over per 100 persons aged 15-64, for Yuma County, AZ, is 31.7.
- Total dependency ratio for Yuma County, AZ is 67.0.
- Potential support ratio, which is the number of youth (working age population) per elderly, for Yuma County, AZ is 3.2.

Here's the Yuma County, AZ's male and female population across different age groups:
Age Group | Population(Male) | Population(Female) | Total Population |
---|---|---|---|
Under 5 years | 7,143 | 7,139 | 14,282 |
5 to 9 years | 6,831 | 6,618 | 13,449 |
10 to 14 years | 7,875 | 7,316 | 15,191 |
15 to 19 years | 7,531 | 6,971 | 14,502 |
20 to 24 years | 9,782 | 6,439 | 16,221 |
25 to 29 years | 8,315 | 6,589 | 14,904 |
30 to 34 years | 7,294 | 6,089 | 13,383 |
35 to 39 years | 6,250 | 5,109 | 11,359 |
40 to 44 years | 5,787 | 5,276 | 11,063 |
45 to 49 years | 4,876 | 5,168 | 10,044 |
50 to 54 years | 5,038 | 5,146 | 10,184 |
55 to 59 years | 4,859 | 4,811 | 9,670 |
60 to 64 years | 4,864 | 5,329 | 10,193 |
65 to 69 years | 4,551 | 5,574 | 10,125 |
70 to 74 years | 4,625 | 4,633 | 9,258 |
75 to 79 years | 4,192 | 4,879 | 9,071 |
80 to 84 years | 2,914 | 2,807 | 5,721 |
85 years and over | 2,185 | 2,139 | 4,324 |
Things to know
What is the population of Yuma County, AZ under 18?
Yuma County's population under the age of 18 is 51,483, as per the latest U.S. Census Bureau's American Community Survey estimates. This population is 25.37% of the total resident population of Yuma County, AZ.
What is the aging population in Yuma County, AZ?
Yuma County's population aged 65 years and above was 38,499. As per the U.S. Census Bureau's American Community Survey, this population is 18.97% of the entire population.
References
- U.S. Census Bureau American Community Survey (ACS) 2017-2021 5-Year Estimates